257931302313 has 4 divisors (see below), whose sum is σ = 343908403088. Its totient is φ = 171954201540.

The previous prime is 257931302311. The next prime is 257931302341. The reversal of 257931302313 is 313203139752.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 257931302313 - 2¹ = 257931302311 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257931302311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42988550383 + ... + 42988550388.

It is an arithmetic number, because the mean of its divisors is an integer number (85977100772).

Almost surely, 2^257931302313 is an apocalyptic number.

It is an amenable number.

257931302313 is a deficient number, since it is larger than the sum of its proper divisors (85977100775).

257931302313 is an equidigital number, since it uses as much as digits as its factorization.

257931302313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85977100774.

The product of its (nonzero) digits is 102060, while the sum is 39.

The spelling of 257931302313 in words is "two hundred fifty-seven billion, nine hundred thirty-one million, three hundred two thousand, three hundred thirteen".